To win the U.S. Open, tennis players must overcome fearsome opponents, grueling matches and searing heat. But for some, none of that causes quite as much angst as the prospect of rubbing on a gob of white lotion.

Of all the accessories that players have at their disposal, sunscreen may be their least favorite. Some don't wear it at all. Some apply it before daytime matches, if somewhat begrudgingly. But nobody seems to like it.